[jira] [Work started] (KAFKA-3777) Extract the existing LRU cache out of RocksDBStore

["Anna Povzner (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-3777?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on KAFKA-3777 started by Anna Povzner.
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> Extract the existing LRU cache out of RocksDBStore
> --------------------------------------------------
>
>                 Key: KAFKA-3777
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3777
>             Project: Kafka
>          Issue Type: Sub-task
>          Components: streams
>    Affects Versions: 0.10.1.0
>            Reporter: Eno Thereska
>            Assignee: Anna Povzner
>             Fix For: 0.10.1.0
>
>
> The LRU cache that is currently inside the RocksDbStore class. As part of KAFKA-3776 it needs to come outside of RocksDbStore and be a separate component used in:
> 1. KGroupedStream.aggregate() / reduce(), 
> 2. KStream.aggregateByKey() / reduceByKey(),
> 3. KTable.to() (this will be done in KAFKA-3779).
> As all of the above operators can have a cache on top to deduplicate the materialized state store in RocksDB.
> The scope of this JIRA is to extract out the cache of RocksDBStore, and keep them as item 1) and 2) above; and it should be done together / after KAFKA-3780.
> Note it is NOT in the scope of this JIRA to re-write the cache, so this will basically stay the same record-based cache we currently have.



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